The McCabe visualization/reverse-engineering toolset
(http://www.mccabe.com) has some tools for doing code comparison on a
number of fronts, such as flowgraph and variable name usage (there were
a trillion options as I recall I used to work for them ;))

> [moderator: Man, do I know some programs that could use that kind of attention.> I'd hope these would be found in "lower CASE" program analysis tools,> but I'm not familiar enough with CASE to know. -John]